Prediction of Joint Durability between Adhesive Resin Cement and Dental Alloy.

在工业领域，R.A.Glendhill et al. （J.Adhesion, 1980, vol.11, p3-15）开发了一种仅需要胶粘剂的扩散系数、平衡吸水率和短期力学性能信息即可预测接头耐久性的方法。本研究的目的是确定是否可以使用该分析来预测牙科用12% Au-Ag-Pd合金与商用4-META牙科胶粘剂树脂水泥粘合在20、37、50、60 c水中的拉伸对接接头的接合耐久性。树脂水泥与合金之间界面的渗透水量由菲克吸水方程计算。以及水泥中的扩散系数和平衡吸水量。按ASTM标准计算应力强度系数，并测定了在60℃水中浸泡3天的拉伸粘接强度。利用这些值和水浓度剖面，推导出测试前温度和浸泡时间对接头断裂应力的影响。为了确保节点耐久性预测的准确性，将理论预测值与实验测定的60℃时的强度值进行了比较。预测结果与实验结果吻合较好。

In industrial field, R.A.Glendhill et al. (J.Adhesion, 1980, vol.11, p3-15) developed a method for predicting the joint durability which only required the information about the diffusion coefficient and equilibrium water uptake in adhesives and the short-term mechanical properties. The object of this study is to determine whether it is possible to use this analysis for predicting the joint durability of tensile butt joints, consisting of a dental 12% Au-Ag-Pd alloy bonded with a commercial 4-META dental adhesive resin cement immersed in water at 20ﾟ,37ﾟ,50ﾟ and 60ﾟCThe amount of water penetrated at the interface between the resin cement and the alloy was calculated from the Fick's equation for water absorption, and the diffusion coefficient and equilibrium water uptake in the cement. The stress-intensity factor was obtained according to the ASTM standard, and the tensile adhesive strength immersed in water at 60ﾟC for three days was also determined. Using these values and the water concentration profile, values of joint's fracture stress were then deduced as a function of the temperature and immersion time prior to testing. To make sure that the prediction of the joint durability is appropriate, the theoretically predicted values were compared to the experimentally determined strength values at 60ﾟC.The agreement between the prediction and experimental measurements was good.